JPH06134026A - Deodorant - Google Patents

Abstract

PURPOSE:To obtain a deodorant effective for various odors within a wide temp. range from low temp. to high temp. by providing activated carbon and other deodorizing element high in the adsorbing capacity of acidic and alkaline adors and adsorbing the neutral odors discharged from activated carbon at the time of high temp. CONSTITUTION:This deodorant 2 is obtained by mixing fine granular activated carbon 4 and fine granular Na-type zeolite 6 as deodorizing elements by an equal wt. and the shapes of activated carbon 4 and Na-type zeolite can be arbitrarily set. Na-type zeolite 6 is one kind of alkali metal type zeolites and corresponds to one wherein M<+> in the structural formula of alkali metal type zeolite is substituted with Na<+>. In this deodorant, a neutral offensive smell 10 is mainly adsorbed by the activated carbon 4 at low temp. and an acidic odor 18 and an alkaline odor 20 are adsorbed by Na-type zeolite 6. The odor adsorbed at low temp. by the activated carbon 4 is discharged at high temp. but this discharged odor is adsorbed by Na-type zeolite 6.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a deodorant, and more particularly to a deodorant effective against various odors in a wide range of temperature conditions from low temperature to high temperature.

[0002]

2. Description of the Related Art Activated carbon is a substance that has a very high adsorption capacity for solute in a solution as well as gas, so it has been widely used as a deodorizing element in various deodorizing agents such as refrigerator deodorizing agents. There is. However, activated carbon is benzene,
High adsorption capacity for neutral odors (neutral odors) such as non-polar hydrocarbons such as toluene, but adsorption for acidic odors (acidic odors) such as hydrogen sulfide and alkaline odors (alkaline odors) such as ammonia and amines Noh is low. This is because activated carbon has a non-polar surface and adsorption is due to van der Waals force accompanied by capillary condensation.

[0003] In order to compensate for the low adsorbability of activated carbon to acidic and alkaline odors, many deodorants obtained by adding a substance having a high adsorbability to acidic or alkaline odors to activated carbon have been known. (Japanese Patent Publication Sho 56-285
73, JP-A-54-60286, JP-A-54-162692, JP-A-55-51421, JP-A-59-151963, etc.).

[0004]

By the way, activated carbon is
It has a high odor adsorption capacity at low temperatures (normal room temperature), but it has a low adsorption capacity at high temperatures. Therefore, activated carbon is deodorized in an environment with large temperature changes. When used as, the activated carbon releases the odor adsorbed at low temperature again at high temperature. Most of the odors re-emitted by the activated carbon are neutral odors that the activated carbon is likely to adsorb. Therefore, an additive substance that adsorbs an acidic odor or an alkaline odor as described in the above publications can efficiently adsorb it. Can not. Such a property that activated carbon has a reduced adsorption ability at high temperatures has not been a serious problem because the necessity of deodorization under high temperature conditions has been neglected.

However, the need for deodorization under high temperature conditions is
For example, when considering deodorization in the passenger compartment of an automobile, it is found to be extremely high. It is known that the temperature inside a car becomes extremely high when the car is parked outdoors with the windows closed and the sun heats up the air inside the car when it is sunny. . Various odors exist in the vehicle compartment, such as an alkaline odor such as an amine odor emitted from an interior material made of phenolic resin, an acidic odor such as an occupant's body odor, and a solvent-based neutral odor. Conventionally, it is known that a deodorant that absorbs a specific odor such as interior materials is applied to the back surface of interior materials, but as a deodorant for various general odors (mainly neutral odors) in the passenger compartment, It was only known that activated carbon was used alone as a deodorizing element.

As described above, since the activated carbon has a low adsorption capacity at high temperatures, even if such a deodorant having only the activated carbon as a deodorizing element is used, the activated carbon regenerates the adsorbed odor when the temperature inside the vehicle rises. The odor is released, and when the occupant gets in the vehicle, the interior of the vehicle is filled with the odor released again. The odor in the passenger compartment gradually becomes less noticeable as the windows open to ventilate the odor, the temperature inside the passenger compartment decreases, the activated carbon adsorption capacity increases again, or the occupant's sense of smell becomes used to the odor. Although it disappears, an unpleasant sensation due to the odor inside the passenger compartment will inevitably occur during boarding. Such a problem is due to the fact that there has been no deodorant having a high deodorizing effect against various odors under a wide range of temperature conditions from low temperature to high temperature.

An object of the present invention is to provide a deodorant effective against various odors in a wide range of temperature conditions from low temperature to high temperature.

[0008]

As a means for solving the above-mentioned problems, in the deodorant according to claim 1 of the present invention, activated carbon and its ability to adsorb acidic and alkaline odors are high, and the activated carbon is released at high temperature. And other deodorizing elements for adsorbing the neutral odor.

The other deodorizing element may be a single substance or a combination of a plurality of substances.

As a specific embodiment of the deodorizing agent according to claim 1 of the present invention, in the deodorizing agent according to claim 2 of the present invention, the other deodorizing element according to claim 1 is an alkali metal type zeolite.

The structural formula of the above-mentioned alkali metal type zeolite is as follows.

[0012]

[Chemical 1]

[0013]

In the deodorant according to the first aspect of the present invention, activated carbon adsorbs mainly neutral odors and other deodorizing elements adsorb acidic odors and alkaline odors at low temperatures. When the temperature is high, the activated carbon releases the odor adsorbed at the time of low temperature, and the deodorizing element adsorbs the released odor. Therefore, it becomes possible to effectively function against various odors in a wide temperature range from low temperature to high temperature.

The alkali metal type zeolite has both acidic and alkaline exchange groups, and can adsorb both acidic and alkaline odors. Also,
It has a large amount of water of crystallization, and when the water of crystallization is released at a high temperature, the trace becomes a cavity, and it becomes possible to adsorb a neutral odor there through the pores. That is, in the deodorizing agent according to claim 2 comprising activated carbon and alkali metal-type zeolite, the activated carbon adsorbs mainly neutral odors and the alkali metal-type zeolite adsorbs acidic odors and alkaline odors at low temperature. To do. At high temperatures, activated carbon releases odors (mainly neutral odors) that have been adsorbed at low temperatures, and the odors that are released are adsorbed by the alkali metal zeolite. Therefore, it becomes possible to effectively function against various odors in a wide temperature range from low temperature to high temperature.

As described above, the deodorant according to the present invention can adsorb various odors such as an acidic odor, an alkaline odor and a neutral odor under a wide range of temperature conditions from low temperature to high temperature. As a deodorant used in a space where people enter and leave when the temperature changes greatly, such as the interior of an automobile, it has a very excellent deodorizing effect.

[0016]

EXAMPLES Examples of the deodorant according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a diagram showing a schematic structure of a deodorant according to one embodiment of the present invention. As shown in the figure, the deodorant 2 according to the present embodiment is composed of activated carbon 4 finely manufactured as a deodorant element.
And Na-type zeolite 6, which is also produced in the form of fine particles, are mixed in equal weights. The shapes of the activated carbon 4 and the Na-type zeolite 6 can be various shapes. The Na-type zeolite 6 is a kind of alkali metal-type zeolite, and its structural formula corresponds to that of the structural formula of the alkali-metal-type zeolite shown in [Chemical Formula 1] in which M ⁺ is replaced with Na ⁺ .

The following experiment was conducted to examine the deodorizing effect of the deodorant 2 according to this example. FIG. 2 is a schematic diagram of an experimental device for investigating the deodorizing effect.

As shown in the drawing, a neutral odor (toluene) is injected into the closed container 8 containing the deodorant 2 according to this embodiment, and the temperature inside the closed container 8 is changed (raised from 20 ° C. or lower to 80 ° C.). Then, the change in the concentration of toluene was measured while lowering it again to 20 ° C or lower (this example). For comparison, an experiment was carried out in combination with the case where only activated carbon 4 was put alone (Comparative Example-1) and the case where only Na-type zeolite 6 was put alone (Comparative Example-2). The result is shown in FIG. In addition,
The amount of each material used in the experiment is shown in Table 1.

[0020]

[Table 1]

As shown in FIG. 3, it was confirmed that the deodorant 2 according to the present example exerts an excellent deodorizing effect over a wide temperature range from low temperature to high temperature with respect to neutral odor.
It is considered that the deodorizing action of the deodorant 2 according to the present embodiment is mainly due to the following functions. FIG. 4 is a diagram conceptually showing the deodorizing action of the deodorant 2 according to this embodiment.
(a) shows the low temperature and (b) shows the high temperature.

As shown in FIG. 4 (a), at low temperature,
The activated carbon 4 adsorbs the neutral odor 10 by the Van der Waals force accompanied by capillary condensation, while the Na-type zeolite 6 adsorbs a large amount of water (crystal water) 12 by the Van der Waals force. The Na-type zeolite 6 is an acidic exchange group.
It has both 14 and an alkaline exchange group 16 and has a high ability to adsorb acidic odors 18 and alkaline odors 20, and when these odors 18 and 20 are present, it is necessary to adsorb these odors 18 and 20. Become. As shown in FIG. 4 (b), at high temperature, the adsorbing ability of the activated carbon 4 is reduced, and the activated carbon 4 releases the adsorbed neutral odor 10. On the other hand, the Na-type zeolite 6 releases the adsorbed water 12 and adsorbs the neutral odor 10 released by the activated carbon 4 through the pores in the trace of the water 12 that has escaped. The deodorizing action of the deodorizing agent 2 according to this example can be confirmed from the experimental result shown in FIG.

Further, the following experiment was conducted in order to investigate the adsorption ability of the deodorant 2 according to this example for various odors at high temperature. As the experimental apparatus, the one shown in FIG. 2 was used, and the temperature in the closed container 8 containing the deodorant 2 (mixed with 1 g of activated carbon 4 and 1 g of Na-type zeolite 6) according to this example was set to 90 ° C. It was kept and odor was gradually injected into it (this example). The experiment was divided into three types: one in which an acidic odor (acetic acid) was injected, one in which a neutral odor (toluene) was injected, and one in which an alkaline odor (trietheramine) was injected. For comparison, the same experiment was performed when only activated carbon 4 (1 g) was added alone (Comparative Example).
The results are shown in FIGS.

As shown in FIGS. 5 to 7, it was confirmed that the deodorant 2 according to the present example has a high adsorbing ability for various odors at high temperature and exhibits an excellent deodorizing effect.

As described above, it was confirmed that the deodorant 2 according to the present example has an excellent deodorizing effect against various odors in a wide temperature range from low temperature to high temperature. The deodorant 2 according to the present embodiment is particularly suitable as a deodorant in an environment in which a person greatly enters and leaves at a high temperature, such as an interior of an automobile.

As a method of actually using it as a deodorant for vehicle interior, a method of putting the above-mentioned deodorant in a container having air permeability and directly installing it in the vehicle interior is conceivable. Even in that case, a sufficiently high deodorizing effect can be expected. However, in this case, it is necessary to secure an installation space for the deodorant container. Therefore, the following method can be considered as a method of using the deodorant that does not require such a space.

First, the above deodorant is mixed with activated carbon used as a deodorizing element, Na type zeolite and the like in the following proportions to form an emulsion.

Activated carbon 2.0 g Na-type zeolite 2.0 g Water-absorbing agent 0.1 g Water 50 ml Binder resin 2.0 g This is gelled and applied to the back of a vehicle interior seat or ceiling material, or a deodorizing emulsion prepared in the above mixing ratio. Spray with a spray gun on the back side of the fabric for the vehicle interior seat and ceiling, and then dry and mold. Also, it is applied to a blower filter such as an air conditioner in the same manner as above.

When such a method is used, the space for installing the deodorant container is not necessary, and the appearance of the vehicle interior is not spoiled.

The deodorant according to the present invention has been described in detail above with reference to the examples. However, the deodorant according to the present invention is not limited to the mode of the examples, and various modifications can be made. It is possible.

For example, although Na-type zeolite is used as another deodorizing element added to activated carbon in the above-mentioned embodiment,
The a-type zeolite may be replaced with other alkali metal-type zeolite such as K-type zeolite and Li-type zeolite, or a mixture of these several kinds of alkali metal-type zeolite may be used.

Further, the deodorant according to the present invention can be used not only for indoor use of vehicles such as automobiles but also in various spaces.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a deodorant according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of an experimental apparatus for examining the deodorizing effect of the deodorant shown in FIG.

FIG. 3 is a diagram showing a deodorizing effect of the deodorizing agent shown in FIG. 1 on a temperature change.

FIG. 4 is a view conceptually showing a deodorizing action of the deodorant shown in FIG.

FIG. 5 is a diagram showing the deodorizing effect of the deodorant shown in FIG. 1 on acidic odor at high temperature.

FIG. 6 is a diagram showing the deodorizing effect of the deodorizing agent shown in FIG. 1 on neutral odor at high temperature.

FIG. 7 is a diagram showing the deodorizing effect of the deodorant shown in FIG. 1 against alkaline odor at high temperature.

[Explanation of symbols]

 2 Deodorant 4 Activated carbon 6 Na-type zeolite (alkali metal type zeolite) 10 Neutral odor 12 Water 18 Acid odor 20 Alkaline odor

Claims (2)

[Claims] 1. A deodorant comprising an activated carbon and another deodorizing element having a high adsorption ability for an acidic odor and an alkaline odor and adsorbing a neutral odor released by the activated carbon at a high temperature. 2. The deodorizing agent according to claim 1, wherein the other deodorizing element is an alkali metal type zeolite.